<template>
	<Header></Header>
	<div class="courseContainer">
	    <div class="courseInfoTop">
	      <div class="info-container">
	        <ul class="route">
	          <li class="route-item" style="cursor: pointer">
	            <router-link to="/course" style="color: #fff">课程</router-link>
	          </li>
	          <li class="route-item"><el-icon><arrow-right /></el-icon></li>
	          <li class="route-item" style="cursor: pointer">
              {{ courseInfo.discountPrice==0 ? '免费课' :'会员课' }}
            </li>
	          <li class="route-item"><el-icon><arrow-right /></el-icon></li>
	          <li class="route-item">{{ courseInfo.courseName }}</li>
	        </ul>
	        <div class="name">{{ courseInfo.courseName }}</div>
	        <div class="info">
	          <div class="Avat">
	            <img src="../assets/img/Avat62.png" alt="" />
	          </div>
	          <ul class="teacherName">
	            <li class="name-item">
	              {{ courseInfo.courseName }}
	              <img src="../assets/img/teacherStart.png" alt="" />
	            </li>
	            <li class="name-item">金牌讲师</li>
	          </ul>
	          <ul class="access">
	            <li class="access-item">难度</li>
              <li class="access-item">{{courseTypeFn(courseInfo.courseLevel) }}</li>
              <li class="access-item">·</li>
              <li class="access-item">时长</li>
              <li class="access-item">{{courseInfo.totalHour}}个小时</li>
              <li class="access-item">·</li>
              <li class="access-item">学习人数</li>
              <li class="access-item">{{courseInfo.purchaseCounter + courseInfo.purchaseCnt}}人</li>
              <li class="access-item">·</li>
              <li class="access-item">综合评分</li>
              <li class="access-item">10.00</li>
	          </ul>
	        </div>
	      </div>
	    </div>

	    <div class="info-nav">
	      <div class="nav-container">
	        <div class="chapter-item" @click='active=true'> 
	          <div :class="active?'active1':''">章节</div>
	          <div class="line" :class='active?"active2":""'></div>
	        </div>
	        <div class="chapter-item" @click='active=false'>
	          <div :class="!active ? 'active1':''">下载资料</div>
	          <div class="line" :class='!active ? "active2" : ""'></div>
	        </div>
	      </div>
	    </div>
	    <div class="course" v-if='active'>
	      <div class="main">
	        <div class="introduction">
	          <div class="desc">
	            该课程暂无介绍
	          </div>
	          <div class="btn">
	            <button class="btn-item active">立即购买</button>
	            <button class="btn-item" @click='addCart'>加入购物车</button>
	          </div>
	        </div>
	        <div class="video" 
              v-for="item in courseChapters" 
              :key="item.id"
            >
	          <div class="chapterName">{{ item.chapterName }}</div>
	          <div class="chapterDesc">{{ item.description }}</div>
	          <ul class="videos">
	            <li class="video-item" 
                v-for="k in item.children" 
                :key="k.id"
              >
	              <div class="video-itemIcon">
	                <i class="el-icon-video-camera"></i>
	              </div>

	              <div class="item-name">
	                <span class="shipin">视频：</span>
	                <span class="chapterName">{{ k.chapterName }}</span>
	                <span class="free" v-if='k.publicType==2'>试看</span>
	              </div>
	              <button class="btn-learn" @click='goPlay(item,k.id)'>开始学习</button>
	              <div class="clearfloat"></div>
	            </li>
	          </ul>
	        </div>
	      </div>
	    </div>
	    <div v-else>
	      <div v-if='attachments.length > 0'>
	        <div class="down" 
            v-for='item in attachments'
            :key='item.id'
          >
	          <div class="source">
	            <span class="downloadCourse">{{ item.attachmentName }}</span>
	            <button class="downloadbtn" @click="downloadSource(item)">下载资料</button>
	          </div>
	        </div>
	      </div>
	      <div v-else>
	        <el-empty
	          description="该课程暂无资料"
	        ></el-empty>
	      </div>
	    </div>
	  </div>
	<Foot></Foot>
</template>

<script setup>
//字体图标
import { ArrowRight } from "@element-plus/icons-vue";
//mixin
import mixin from '../mixins/courseType.js'
let { courseTypeFn } = mixin();
//组件
import Header from '../components/common/Header.vue'
import Foot from '../components/common/Foot.vue'
//api
import { getCourseDetail , courseCheckAuth , downloadAttachment } from '../utils/api/courseManage'
//课程id
import { useRoute } from 'vue-router'
let route = useRoute();
let courseId = route.params.id;
//切换章节和下载资料
let active = ref(true);
//判断下载资料数据
let attachments = ref([]);
//课程章节的数据
let courseChapters = ref([]);
//课程详情的数据
let courseInfo = ref({});
//生命周期
onBeforeMount(()=>{
  getCourseDetail({
    courseId
  }).then(res=>{
    courseInfo.value = res.data.data;
    //下载资料
    attachments.value = res.data.data.bizCourseAttachments
    //课程章节
    courseChapters.value = res.data.data.bizCourseChapters
  })
})

//element-plus
import { ElMessage } from 'element-plus';
//router
let router = useRouter();
//pinia
import { useUserStore } from '@/store/user'
//下载资料
const downloadSource = ( item )=>{
  //判断是否是登录状态，如果没有登录，进入登录页面
  if( !useUserStore().token ){
      ElMessage.info({
        message: '请先登录'
      });
      router.push('/login');
      return ;
  }
  //如果是登录状态
  courseCheckAuth({
    courseId:item.courseId
  }).then(res=>{
    //如果没有权限，提醒购买
    if( !res.data.data.hasAuth ){
      ElMessage.info({
        message: '购买该课程才可以下载资料'
      });
      return ;
    }
    //有权限
    downloadAttachment({
      courseId:item.courseId,
      attachmentId:item.id
    }).then(res=>{
      const blob = new Blob([res]);
      let fileName = item.attachmentName;
      let fileUrl = item.attachmentUrl;
      const extName = fileUrl.substring(
          fileUrl.lastIndexOf('.')
      );
      fileName = fileName + extName;
      const link = document.createElement('a');
      link.download = fileName;
      link.target = '_blank';
      link.style.display = 'none';
      link.href = URL.createObjectURL(blob);
      document.body.appendChild(link);
      link.click();
      URL.revokeObjectURL(link.href);
      document.body.removeChild(link);
    })
  })
}

//开始学习
const goPlay = ( item , chapterId )=>{
  //判断是否是登录状态，如果没有登录，进入登录页面
  if( !useUserStore().token ){
      ElMessage.info({
        message: '请先登录'
      });
      router.push('/login');
      return ;
  }
  //如果是登录状态
  courseCheckAuth({
    courseId:item.courseId
  }).then(res=>{
    //如果没有权限，提醒购买
    if( !res.data.data.hasAuth ){
      ElMessage.info({
        message: '购买该课程才可以下载资料'
      });
      return ;
    }
    //有权限
    router.push({
      path: '/course-play/' + item.courseId +'/'+ chapterId,
    })
  })
}

import { addShopCar } from '@/utils/api/cart'
import { createToken } from '@/utils/api/createToken'
//加入购物车
const addCart = ()=>{
  createToken().then(res=>{
    let token = res.data.token;
    addShopCar({
      courseId,
      memberId: useUserStore().userInfo.id
    },token).then(res=>{
      if( res.meta.code =='200' ){
        ElMessage.success({
          message: '加入购物车成功～'
        });
        return;
      }else{
        ElMessage.info({
          message: '添加失败～该课程已经在购物车中了!'
        });
      }
    })
  })
}
</script>

<style scoped>
.courseContainer {
  width: 100%;
  height: 100%;
  background: #f8fafc;
  overflow: hidden;
}
.main {
  margin: 40px auto;
  width: 1200px;
  height: 100%;
}
.courseInfoTop {
  width: 100%;
  height: 200px;
  background-image: url("../assets/img/courseInfobg1920.png");
}
.nav-container {
  width: 1200px;
  margin: 0 auto;
  color: #333333;
  display: flex;
}
/* .chapter-item  .active{
    color: #388FFF;

} */
/* 背景部分开始 */
.courseInfoTop .info-container {
  margin: 0 auto;
  width: 1200px;
  height: 200px;
  color: #ffffff;
  z-index: 5;
}
.route {
  /*margin-left: 50px;*/
  padding-top: 20px;
  display: flex;
  font-size: 14px;
}
.route .route-item {
  margin-right: 10px;
}
.name {
  margin: 30px 0 10px 0px;
  font-size: 24px;
}
.info {
  display: flex;
  /*margin-left: 50px;*/
}
.info .Avat {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}
.info .Avat img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}
.teacherName {
  margin: 8px 0 0 8px;
}
.name-item img {
  width: 14px;
  height: 14px;
}
.access {
  margin: 0 0 0 100px;
  display: flex;
}
.access .access-item {
  margin-right: 10px;
  line-height: 60px;
}
/* 背景部分结束 */

/* 导航栏开始 */
.info-nav {
  width: 100%;

  background: #ffffff;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.16);
}
.course {
  margin: 0 auto;
  width: 1200px;
}
.chapter {
  display: flex;
  font-weight: 600;
  color: #333333;
  margin-left: 50px;
  font-size: 20px;
}
.chapter-item {
  padding-bottom: 8px;
  font-size: 20px;
  font-weight: bold;
  line-height: 80px;
  margin-right: 70px;
  cursor: pointer;
  position: relative;
}
.chapter-item .active1 {
  color: #388fff;
}
.chapter-item .active2 {
  position: absolute;
  width: 70%;
  top: 63px;
  left: calc(30% / 2);
  height: 4px;
  background: #388fff;
  border-radius: 2px;
}

/* 导航栏结束 */
/* 课程介绍开始 */
.introduction {
  /*margin-left: 50px;*/
  /*padding: 20px;*/
  width: 1210px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.desc {
  padding: 20px;
  color: #474747;
  line-height: 35px;
}
.btn {
  float: right;
  margin-top: 10px;
  padding: 0 20px 20px;
}
.btn-item {
  width: 120px;
  height: 40px;
  /*margin: 0 20px 0 0;*/
  padding: 0px;
  border: 0px;
  outline: none;
  color: #f11d1d;
  border-radius: 23px;
  cursor: pointer;
}
.btn .active {
  background: #f11d1d !important;
  color: #ffffff;
  margin-right: 10px;
}
/* 课程介绍结束 */

/* 视频目录开始 */
.video {
  margin: 20px 0;
  padding: 20px;
  width: 1170px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.video .chapterName {
  font-weight: bold;
  font-size: 20px;
  color: #333333;
}
.video .free {
  padding-left: 20px;
  font-size: 14px;
  color: #388fff;
}
.chapterDesc {
  margin: 10px 0;
  font-size: 13px;
  color: #5c5c5c;
}
.video-item {
  height: 40px;
  line-height: 40px;
  padding: 5px 0;
  /*margin: 0 0 10px 0;*/
  border-radius: 8px;
}
.video-item:hover {
  cursor: pointer;
  background: rgba(53, 133, 255, 0.2);
  border-radius: 8px;
  color: #388fff !important;
}
.video-item .shipin {
  color: #333333;
  font-weight: bold;
}
.video-item .chapterName {
  font-size: 16px;
  font-weight: 400;
  color: #333333;
}
.video-itemIcon,
.item-name {
  float: left;
  padding-left: 10px;
}
.btn-learn {
  margin: 5px 5px 0 0;
  float: right;
  right: -100px;
  width: 80px;
  height: 30px;
  line-height: 30px;
  border: 0px;
  outline: none;
  color: #fff;
  background: #388fff;
  border-radius: 12px;
  cursor: pointer;
}
.clearfloat {
  clear: both;
}
/* 视频目录结束 */
.source {
  margin: 2px 0;
  padding: 5px;
  display: flex;
  justify-content: space-between;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}
.down {
  margin: 10px auto !important;
  width: 1200px;
  height: 100%;
  padding: 5px;
  background: #ffffff;
  box-sizing: border-box;
  border-radius: 8px;
}
.down:first-child {
  margin: 40px 0 5px 0;
}
.downloadbtn {
  width: 100px;
  height: 30px;
  line-height: 30px;
  background: #388fff;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
</style>